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Brought up in https://lists.w3.org/Archives/Public/www-style/2013Dec/0243.html According to the spec, 100vw and 100vh is resolved against the initial viewport. The request is to supply keywords like initial-viewport-width/initial-viewport-height instead. Still, we need to say what vw/vh means in @viewport. It can't be resolved against actual viewport as that would lead to values never stabilizing. Either against initial viewport or dropped descriptors.